Elvis Costello may be decades away from his working-class pub-rock roots, but he still knows better than to cross a picket line. Right now, Costello is about to embark on his Imperial Bedroom & Other Chambers tour, a tour that’ll spotlight his classic 1982 orchestral-pop song-cycle Imperial Bedroom. But one of the shows won’t be happening as planned. On his Facebook page, Costello writes that he’s canceling his 11/1 show at Pittsburgh’s Heinz Hall because the Pittsburgh Symphony Orchestra, which uses the venue, is on strike. On Facebook, he writes, “I hope that the dispute will soon be settled honorably and amicably and that The Imposters and I will have the opportunity to perform at Heinz Hall before too long.”